Brake



Feb. 7, 1928.

W. L. GAUTHIER BRAKE Filed April 28. 1926 attoz het* Patentes Feb. 71,1923. y l

UNITED STATES'-PATENT -OFFICE.

WILLIAM L. GAUTHIER, F FLINT, MICHIGAN, AASIG'NOR T0 GENERAL MOTORS COR- PORATION, 0F DETROIT, MICHIGAN, A CORPORATION 0F DELAWARE.

BRAKE.

This invention relates to brakes and is intended rimarily for use on vehicles. The rake is of the external band type, employing the usual brake anchor and the invention is concerned more particularl with the operating mechanism and thea justments.

One object of the invention isl to provide a novel operating mechanism by which the brake band is conveniently ,applied to the l drum and by which the ends of the band are readily released.

A :further object is to secure conveniently operable adjustments for such a brake.

With the above and other objects in view the invention will be understood from a reading of the following description in connection with the accompanying drawing.

In the drawing:

Figure 1 is a side elevation of a brake mechanism embodying my invention.

Figure 2 is an end elevation of theA same.

Fi re 3 illustrates in elevationa detail, and igure 4 is a section on line 4-4 of Fi re 3.

e invention is shown as applied to a rear wheel of a vehicle.

Referring by reference characters tov thedi'awing, numeral 3 represents `a plate which, together with a guard plate 5, covers nthe opening in a brake drum which is to be secured to the wheel. About this brake drum is located a brake band 9. The usual brake anchor is shown at 11 and at 13 is seen a spring which. serves to. hold the upper portion of the brake band oi the drum. .Se-

' cured to the plate 3 is a plate 15, which latter plate has its endextending-:transversely across the'face of the drum between the ends of the band. Journalled in the cover plate .3 is a shaft 19. This shaft may be rotated by any convenient operating mechanism and is connected to the brake operating means for the application of the brake band to the `drum. Shaft 19 has an arm 21 to which is pivoted a link 23. Thelink 23 is pivoted at its end to aflever 25. This lever is pivoted as at 27 to a lug 28 carried by one end ofthe brake band. For limiting the movement of arm 21ithe arm is provided with a set screw 29 which `may be engaged with a convenient abutment on plate 3, as shown in he other end of the brake'band is` rovided with a lug 31 to which i's pivote ,l as

'the abutment l5.

at 33, a link member 35. This link member passes through an opening in the plate 15 andalso through an opening in the trunnion pin 37 carried by the lever 25. Threaded on the end of the link -35 is a nut 39'which engages the trunnion pin. The link 35 is provided with a shouldered portion 41 be,- tween which and washer 43, positioned against the plate 15, is a coil spring 45 exerting its pressure to push the lower part of the fband awayl from the drum. To limit the action of the coil sprin 45 there is a nut 47 which is threaded on t e link 35 and engages the opposite side of the plate' l5. Above this nut the link 35 is provided with a flat and slidably mounted upon the l1nk is a washer member 49 correspondingly shaped to prevent' its rotation about the link. The. washer member has a projection 51 engaging a depression 53 on the nut. A spring 55 is located between the trunnion and the washer 49 ,and serves to holdthe washer 49 understood.. When the shaft 19 is rocked in a counter-clockwise direction the link 23 and the lever 25 press the upper end of the brake band against the drum and then move link 35 longitudinally to lift the nut 47 away from the plate 15, thus compressin sprin 45 and pressing the lower part of t e ban against the drum. When the manual eiort is released the leverv21 swings back to the brake releasing position and the spring 45 releases the brake, the nut 47 again engaging Should it be desired to adjust the brake bandfon the drum the nut 47 is vturned upon -the threaded portion of the link 35. This will either draw the lower part of the band more snugly about the drum or, if turned upwardly toward the trunnion will enable the spring 45 to space the band further from the drum. In either movement the upper end of the link will be moved and thus change the position of lever 25. -To restore this part to its former position, move-ment of nut 39 to compensate for the movement of nut 47 is required. It

u will be understood that the function of spring 55 is to vprevent the nut 47 from movement on the link and also to maintain thedeiinite spaced relationship Ibetween the trunnion pin and the nut 47.

A brake of this type may be employed upon either a'front'or rear wheel. When applied to a rear wheel the shaft 19 is to be p aced in front of the rear axle. When used in connection with they front Wheel thel o erating sha-ftlis preferably placed above t e front axle.

I claim: 1

1. A brake band operating mechanism in# cluding a drum, a band, a rigid yabutment |20 and a spring between said nut lock' and said lever, said nut lock and spring serving to prevent the rotation of the nut and to mainwith fain the distance between, the nut and the ever.

2.7A brake drum, a band, a ri id abutment between the ends of the ban a lever pivoted to one e`nd of the band and equipped a trunnion in, a link connected to the other end o; the band and passing through the abutment and trunnion pin, an adjusting nut on the end of the link, an adjusting nut on the link engagin tbe abutment, a spring engaging the abutment to release the band, and means including a nut lock engaging said adjusting nut, a second spring between the nut lock and the trunnion, said nut lock with said spring serving to prevent the rotation of the nut and to maintain the distance between the trunnion and the nut.

In testimony whereof I afx my sig-nature.

WILLIAM L. GAUTHIER.

afs 

